Khalifa, H., N. A. Milood Al-Awkally, and S. Muftah Eljamay. “Oral Delivery of Biologics: Recent Advances, Challenges, and Future Perspectives”. African Journal of Advanced Pure and Applied Sciences, vol. 1, no. 2, Apr. 2022, pp. 1-6, doi:10.65418/ajapas.v1i2.36.